\begin{tikzpicture}
	\tkzDefPoint(0,0){O}
	\tkzDefPoint(0:2){A}
	\tkzDefPoint(45:2){B}
	\tkzDrawSegments[thick](O,A  O,B)
	\tkzFillPolygon[pattern={mylines[angle=65, distance={4pt}]}](A,O,B)
	\tkzMarkAngle[-stealth,size=0.5](A,O,B)
	\tkzLabelPoints[below](O, A)
	\tkzLabelPoints[above](B)
\end{tikzpicture}

